Fountain pen



FOUNTAIN PEN Filed March 21, i942 INVENTOR ATTORNEY Patented Aug. 15, 1944 1;

` fig;'QFQUNTMNPN' I JosephWallace, CedarliursnNsX.

` 3 claims; l (c1. izo-12);-

, This invention relates to fountain pensand more particularlyto what aregreferredto as 4theV Y ink-sacks.l or wells of instrumentsiof this type?.

and kind. The novel-ffeatures ofil the'invention will be best .understoodfrom' the follolwing'ldescription, when takentogether with'the accompanyingv drawing, inV which certainy embodimentsl of the invention are disclosed, and in which the` separate parts are designated by suitable Areference characters in, eachofl the Views; and in which Fig. l is a vsectional `View-through. the barrelk of' a pen illustrating one adaptation of the inven-.

tion. v Y

Fig. 2 is a side and sectional view of the inksack detached.

Fig. 3 is a detail sectional view on the line 3 3 of Fig. 2.k

Fig. 4 is an end View of the sack as shown in Figs. 1 3. Y

Fig. 5 is a View similarto Fig.` 4 showing another adaptation of the invention.

Fig. 6 is a View similar toFigs. 4 and 5show-- ing another modication; and

Fig. 7 is a detail view showing a methody of forming anink-sack, substantially similar to those shown in Figs. 1 4 inclusive.

In fountain pens, it has been the .practiceV for many years to employ molded, rubber vsacks in.V the form of elongated, thimble shaped .bodies,orA

rounded closed endQtubes, forltlie storage ,ofY ink in the'barrel of va fountain pen. Theeconstruev tion `of 'such devices :hasfnecessitated a molding operation; thus production Ahas been relatively` It is the purpose of my invention't'o materially simplify' thel construction' of ink-sacks ofl the character described by providing tubularsections,

cut toa predetermined' length and then com-. pressing oneend' portionof these sections and j uniting the compressed lportions of the sections to form closed end tubes Which will form Very practical ink-sacks- In the compressing operav tion, the compressed Aparts' may bevcementedtogether, particularlyinusing certain types and' kinds yof flexible materials, including variousV kinds of plastic materials, whereas kwith other.'V

plastic materials, the operation is performed by` simply heating one end portion of a tube section and then placing saidendportionof -rthesection between die parts or forming tools to compress the heatingend portion of thesectionnrmly;

which operationfand by virt'ueof` .theheating y of the materialsof the Vsection,'resultsin 3a Sub-'1155 .-1

stantial Welding of tlfl'eopposed rmlycomprevls'sedj Walls. v

:'.Various types `andkindsof exible plastic'maff` terials may be :used informing the tube'sections' ;andjone .of the materials,:` whichcouldfb'e usedg? is known in the trade `as vinylV resin, lone of which4` materials is identied in tlie trade as -Vinylit`e.r For practical purposes it is desirable to use a{ plastic 1 materialhaving -zsucn resiliency' and formed, intoa tube cf` such construction. `as to?- establish a comeback property. sothat upon'com-y pression of the sack/by the usual llingmecha- 1 nism of thepen, the-sackwill expand to normal position in drawing ink thereinto. It is, of course;

desirable to employ plastic materials Whichwill not be aiected by the Writing iluids usedin the pen nor affect characteristics of the luid.l 'T

To illustrate certain adaptations vof the invenf tion, I have 'shoWnin Fig.' 1 'of the drawing'the* Vbarrel IIJ of a'fountain pen,` the end II ofwhich is closed and the externally threaded en'd I2 loff which .is open* to receive the `detachable section.A The section I3 has a1reduced-portion I4( `fitting snugly within the bore of .the barrelflilj and a further reduced extension I5 upon which the'open end of the ink-sack II-is mounted andy to which the same may be cemented, or othery Wise secured to preventaccidental`dis1f1lacementfY It will thus be seen that as a/customady'- practice, ,the sack I6 is insertable and removable with' respect to the barrel as a unit partof the section'l3.`

As is theusualpractice, the` barrel ofthe pen isprovided'with som'etypeand kind of sack coni"-v f' pressing elements, the specific structure of which forms `no direct part of theV present invention, butn pI 1e type of. suchldevicexi's 'shownfsinipiy tof@ illustratethefgeneral combination.' An elo'nf'gatedI spring I1 isarranged along the wall of the Vbar-'f` rel IILhavng the elongated aperture-I8l therein;A 4with'the curvedend I 9 of the springseatingfin To the free :en'djf 2-of the` spring is secured thecom'pressor bai" 2| v which isiarranged parallel to the spring and I theclosed end I Iof the barrel.

upon the sack I6.V At 22 is shown the operating uponthe spring I1 the sack thevlever in the Well known manner.

whicharecemented or welded in abutting relation to each other as indicated at 3|, note Fig. 3,

to form a substantially unitary structure of the in which *mightbelte'rined pleatedor Vfolded sec-vv tions 32 which, in the construction shown inl Figs. 1-4 inclusive, extends slightly beyond theyY sections, partly illustrated at 36, are compressed outside diameter of the sack I6 but not suiicientY to interfere with free passage of the sack into? the bore of the barrel I0.

' In forming the sack I6, as shown in Figs. 1-4V inclusive, a tube of plastic material, :cutto' the r desired length, is compressed at one end between dies or forming tools which rst slightly compress opposed lsides of the tube, Which defines: the .ul-e timate width of the section 28, and then the other.-

opposed walls are compressed uponV eachother in the cementing, or welding of the latter walls together, confined within the` limits named. The

result of this operation produces the .slightly folded portions, as at 32, and extendsthese Vpor-y X sections. In the illustration in Figs. 5 and 6 of the drawing, the united sections 34 and 35 have been drawn in outline form only, to indicate that these resulting sections actually become a unitary body, particularly when the heating process is employed. Of course, when these parts are cemented together a line of abutment of opposed walls would appear.

In Fig. 7 of the drawing, I have diagrammatically illustrated another method of producingrink-sacks 'of the type and kind disclosed in Figs. 1-4 inclusive, in which the tubular sections are cut at double length and these longer tube Vfc'ientrally, as seen at 31, to unite opposed walls `is headed prior-to. the compressing operation ameter of the tube, as indicated by the wall porthe drawpossible to use sacks of greater outside diameter, Y

thus providingV for a greater storage of ink. It is also noted, upon a consideration of Fig. 1, that the flattened surface of the sealed endsection 28 has the at surface arranged parallel to the surface of the bar2l, thus if the bar were to extend to the full length of -the sack, the section 28 would not interfere with free compressing opera` tion of 'the bar. This flatsection 28 will also guide the operator in proper insertion of the sack in the barrel l0, lthe flat portion being turned sufficiently so that either of-r the shoulders at 32 will not strike the said spring.

Instead of compressing the` vtube sim-ply in two-l directions, in the manner illustrated in Figs. Y1-4 inclusive, the walls of the. tube maybe com` pressed in three directionsby the use of three dies, the result of which would be the formation of a `Y sealed end section 34, instead' of what might Vbe termed the I-section .of Figs -1-4.=-

With this construction, the extension of the tube adjacent the sealed section will be substantially eliminated in that the ribs do not vextendnea'rly` so far from the center.

In Fig. 6 of the drawing is shown another adaptation of the invention, wherein an X or 'cross' shaped section 35 is produced preferably by the use of four dies or forming tools. This construction will draw the adjacent end portion of the tube inwardly and completely dispense with anyr widening of the tube. With the structure shown in Figs. 5 and 6, :it will be desirable. to position the bar 2 I in the valley formed1between'v two off the radially extending ribs which form the Y and which unites the opposed walls in the same manner as set forthin connection with the structure'shown in Figs. 1-4 inclusive.

-YWithra method of production, according to the teachings in-Fig. 7,.the sealing and end closing of ,the sacks is more accurately performed and atthe same time, in a single operation, two complete sacks are produced, the only additional operation required being, severing the workpiece to form two independent sacks, but this can be cared for in direct relationship to the forming operation.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. An ink sack for fountain pens composed of a material other than rubber, said sack comprising an-elongated body of a plastic material such as Vinylite, the wall structure of said tubular body having the characteristics of presenting longitudinal rigidity, free compressibility and being automatically returnable to extended form when means compressing said body is released, the thickness of the wall of said tubular body contributing longitudinal rigidity thereto, means at one end of said tubular body constituting a sealed end, said last named means comprising united opposed wall portions of the tube forming a rib-like sealed section at said end of the tube, saidrib section in combination with the longitudinal rigidity of said tubular body facilitating assemblage of the tubular. body in the pen barrel, said rib section being arranged within longitudinal boundaries of said body and assisting in y n returning the tubular body when compressed to expanded form.

2. An ink sack for fountain pens composed of a material other than rubber, said sack comprising an elongated body of a plastic material such as Vinylite, the wall structure of said tubular body having the characteristics of presenting longitudinal rigidity, free compressibility and being automatically returnable to extend form when means compressing said body is released, the thickness of the wall of said tubular body contributing longitudinal rigidity thereto, means at' one end o'f said tubular body constituting a 'sealed end, said last named means comprising united opposed wall portions of the tube forming a' rib like sealed section at said end of the tube, said rib section in combination with the longitudinal rigidity of of said tubular body fav'-cilita'tn'g assemblage of the tubular body in the pen barrel, said rib section being arranged Within longitudinal boundaries of said body, and said rib section being cross shaped .in cross sectional form and assisting in returning the tubular body, When compressed, to expanded form.

3. An ink sack for fountain pens composed of a material other than rubber, said sack comprising an elongated body of a plastic material such as Vinylite, the wall structure of said tubular body having the characteristics of presenting longitudinal rigidity, free compressibility and being automatically returnable to extended form when means compressing said body is released, the thickness of the Wall of said tubular body tube, said rib section in combination With the longitudinal rigidity of said tubular body facilitating assemblage of the tubular body in the pen barrel, said rib section being arranged Withinl longitudinal boundaries of said body, and said rib section being Y-shaped in cross sectional form and assisting in returning the tubular body, when compressed, to expanded form.

JOSEPH WALLACE. 

